Sena Cases first introduced its Florence model for the iPad 2, and has now made some minor updates to the case with Magnetic Florence for the third-generation iPad ($80). Inside and out, the leather folio is pretty similar to its predecessor with a thin, taper-hugging iPad holder and the ability to transform into a stand. The big difference here comes down to magnets. Not only have they been repositioned to lock and unlock the new iPad's display,…